Sculpting issues

Could somebody please explain me why Blender doing this ugly strips every time when I go to sculpt in multires modifier?
I suppose to think that is a problem in subdivision process but what I did wrong I don’t know. There is UV on object. But I did UV after start sculpting could it be reason why my mesh going corrupted?


This corruption appears when I click on Apply Base, and whole mesh going remapped subdivisions. It helps to update Base mesh but impossible to continue sculpting…

it’s a know bug of multiresolution modifier, especialy when using “apply base”
https://developer.blender.org/T58473

you should convert to mesh before repair your sculpt, and use 2.81 beta new sculpt features like openvdb remesh

if you really want to use multiresolution, put a new multirez on the base mesh
add subdivisions
add a skrinkwarp modifier and select your sculpt (after convert to mesh and repair)
then apply the skrinkwarp
then never touch again “apply base”!

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Thank you for help. Hope they will fix this as soon as possible.